🐛 Bug Report

leetcode-cn.com account can not sign in.

To Reproduce

1. Sign in to LeetCode (EndPoint has been switched to China).
2. Choose sign in method, Leetcode Account.
3. Enter the username and password (Enter the E-mail will have the same problem).
4. Can not sign in with Error: certificate has expired.

Expected behavior

Sign in leetcode-cn.com correctly.

Extension Output

Your Environment

• os: Ubuntu 18.04.4 LTS
• extension settings: default
• nodejs version: v8.10.0
• vscode version: 1,45,1
• extension version: 0.16.2